Title: Newsletter Optin Block
Author: Pascal CESCATO
Published: <strong>August 29, 2025</strong>
Last modified: August 27, 2026

---

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# Newsletter Optin Block

 By [Pascal CESCATO](https://profiles.wordpress.org/pcescato/)

[Download](https://downloads.wordpress.org/plugin/newsletter-optin-block.1.0.5.zip)

 * [Details](https://en-au.wordpress.org/plugins/newsletter-optin-block/#description)
 * [Reviews](https://en-au.wordpress.org/plugins/newsletter-optin-block/#reviews)
 *  [Installation](https://en-au.wordpress.org/plugins/newsletter-optin-block/#installation)
 * [Development](https://en-au.wordpress.org/plugins/newsletter-optin-block/#developers)

 [Support](https://wordpress.org/support/plugin/newsletter-optin-block/)

## Description

Newsletter Optin Block allows you to automatically inject a Contact Form 7 form 
into your WordPress posts and add subscribers to a Mailjet list of your choice.

 * Select the Mailjet list in the admin
 * WordPress repository compatible (escaping, sanitization, etc.)
 * Robust API error handling
 * Works without Composer

External services:
 Mailjet API – allows: – fetching Mailjet contact lists (https://
api.mailjet.com/v3/REST/contactslist) – adding a subscriber and returning a response
code (https://api.mailjet.com/v3/REST/contacts)

### License

This plugin is distributed under the GPLv3 license.

## Installation

 1. Upload the plugin folder to the `/wp-content/plugins/` directory.
 2. Activate the plugin through the ‘Plugins’ menu in WordPress.
 3. Configure your Mailjet API keys and the target list in Settings > Auto-injected
    Form.
 4. Select the Contact Form 7 form to inject.
 5. Go to the Customizer and style the message:
 6. .newsopbl-thank-you-message {
     background-color: #d4edda; color: #155724; border:
    1px solid #c3e6cb; border-radius: 4px; padding: 15px; margin: 20px 0; font-size:
    16px; font-weight: 500; text-align: center; box-shadow: 0 2px 4px rgba(0,0,0,0.1);}

## FAQ

### Is Contact Form 7 required?

Yes, this plugin requires Contact Form 7.

### Are subscribers added to Mailjet?

Yes, if configured correctly, each submission will add the address to the selected
Mailjet list.

## Reviews

There are no reviews for this plugin.

## Contributors & Developers

“Newsletter Optin Block” is open source software. The following people have contributed
to this plugin.

Contributors

 *   [ Pascal CESCATO ](https://profiles.wordpress.org/pcescato/)

[Translate “Newsletter Optin Block” into your language.](https://translate.wordpress.org/projects/wp-plugins/newsletter-optin-block)

### Interested in development?

[Browse the code](https://plugins.trac.wordpress.org/browser/newsletter-optin-block/),
check out the [SVN repository](https://plugins.svn.wordpress.org/newsletter-optin-block/),
or subscribe to the [development log](https://plugins.trac.wordpress.org/log/newsletter-optin-block/)
by [RSS](https://plugins.trac.wordpress.org/log/newsletter-optin-block/?limit=100&mode=stop_on_copy&format=rss).

## Changelog

#### 1.0.0

 * Initial release: automatic injection, Mailjet sync, admin configuration.

## Meta

 *  Version **1.0.5**
 *  Last updated **1 month ago**
 *  Active installations **Fewer than 10**
 *  WordPress Version ** 6.8 or higher **
 *  Tested up to **7.1.2**
 *  PHP Version ** 8.1 or higher **
 *  Language
 * [English (US)](https://wordpress.org/plugins/newsletter-optin-block/)
 * Tags
 * [block](https://en-au.wordpress.org/plugins/tags/block/)[contact form 7](https://en-au.wordpress.org/plugins/tags/contact-form-7/)
   [mailjet](https://en-au.wordpress.org/plugins/tags/mailjet/)[newsletter](https://en-au.wordpress.org/plugins/tags/newsletter/)
   [Optin](https://en-au.wordpress.org/plugins/tags/optin/)
 *  [Advanced View](https://en-au.wordpress.org/plugins/newsletter-optin-block/advanced/)

## Ratings

No reviews have been submitted yet.

[Your review](https://wordpress.org/support/plugin/newsletter-optin-block/reviews/#new-post)

[See all reviews](https://wordpress.org/support/plugin/newsletter-optin-block/reviews/)

## Contributors

 *   [ Pascal CESCATO ](https://profiles.wordpress.org/pcescato/)

## Support

Got something to say? Need help?

 [View support forum](https://wordpress.org/support/plugin/newsletter-optin-block/)